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Etymology

Like many members of the Black family, the name Pollux comes from a star. It is the brightest star in the constellation Gemini. The name refers to Castor and Pollux, the twin sons of Zeus and Leda in Greek mythology. The name is traditionally thought to mean "much wine", since astrologers associate Pollux with prosperity and celebration with wine. Pollux's sister Cassiopeia was named after a constellation.

Behind the scenes

On the Black Family Tree, it states that Pollux and (possibly) Irma was thirteen years old when they had their first child. This is most likely one of the numerous mathematical mistakes made by J. K. Rowling (who frequently admits that maths is not her strong suit). Then again, it's possible Rowling is discreetly showing us that teenage pregnancy is as common in the Wizarding world as it is in the Muggle world.

Based on a statement by Horace Slughorn, Pollux may have been a member of the Slytherin House. This is likely due to most of the Black family (with the exception of Sirius Black) being in the aforementioned House. However, he attended Hogwarts c. 1923 - 1930, when Slughorn may not have been Potions master.